57
Rev 2.1
Table 4.7 – Domestic Hot Water (DHW) Configuration Parameters
4-21 Modulation Configuration Parameters
Table 4.8 displays Modulation configuration parameters.
Refer to 5-4 MODULATION RELATED CONFIGURATION for Modulation parameter programming.
Parameter Comment Password
CH maximum modulation rate RPM
These parameters provide the limits of fan speed during
modulation.
Installer
DHW maximum modulation rate RPM
These parameters provide the limits of fan speed during
modulation.
Installer
Minimum modulation rate RPM Read Only
CH forced rate time 0-600 seconds
This parameter determines the duration of the forced rate
period, when firing for CH or LL demand. If it is set to zero
then this forced rate period is disabled.
Installer
CH forced rate RPM
This parameter provides the firing rate during the CH
forced rate time. It is also the initial rate
for the CH slow start period.
Installer
DHW forced rate time 0-600 seconds
This parameter determines the duration of the forced rate
period, when firing for DHW
demand. If it is set to zero then this forced rate period is
disabled.
Installer
DHW forced rate RPM
This parameter provides the firing rate during the DHW
forced rate time. It is also the initial rate for the DHW slow
start period.
Installer
CH slow start enable Disable or Enable CH slow start
This parameter enables or disables the slow start limit
function for CH and LL demand sources. It uses the CH
forced rate parameter as the starting point for the slow
start. If the forced rate parameter is invalid or zero and
slow start is enabled, then the slow start function does not
occur and an alert is issued.
Installer
DHW slow start enable Disable or Enable DHW slow start
This parameter enables or disables the slow start limit
function for DHW demand source. It uses the DHW
forced rate parameter as the starting point for the slow
start. If this forced rate parameter is invalid or zero and
slow start is enabled, then the slow start function does not
occur and an alert is issued.
Installer
Slow start degrees 32 °F to 180 °F (0 °C to 100 °C)
If slow start limiting is enabled and the outlet temperature
is less than the temperature provided by subtracting this
number of degrees from the setpoint, then slow start rate
limiting is effective. Whenever the outlet temperature is
above this value, slow start limiting has no effect.
Installer
Slow Start Ramp RPM /minute
When slow start limiting is effective, the modulation rate
will increase no more than the amount per minute given
by this parameter.
Installer
0-10/4-20 mA Output hysteresis Value selects the amount of error (proportional error)
needed to reverse direction.
Installer
4-20 mA input hysteresis There is no resistance to change in the same direction as
the last change, but to reverse directions; the input
change must exceed the value provided here.
Installer
Table 4.8 – Modulation Configuration Parameter
4-22 Pump Configuration Parameters
Table 4.9 displays Pump configuration parameters.
Refer to 5-5 PUMP CONTROL RELATED CONFIGURATION for Pump parameter programming.
To Next Page
Loading...
Need help?
General